Table 2

Line ratios and estimated column densities of the observed GMCs.

GMC C GMC E

[C II]/12CO(1–0) 482 4236/692
[C II]/12CO(2-1) 142 1223/150
[C I]/12CO(1–0) 6.5 –/9.4
[C I]/12CO(2–1) 1.9 –/2.4
12CO(4–3)/12CO(1–0) 20.7 21.1(–)
N[CII] /[1017cm-2]a 1.4 0.9/1.6

PDR model results

n⟩  [103 cm-3] 5.0 10/2.0
Mtot   [106M] 20 2.0/15
χ   [Draine] 7 300/5

Notes. For GMC E we give the values for the high/low velocity components. The PDR fit assumes a distance of 3.9 Mpc. The line ratios were calculated from line-integrated intensities in units of erg s-1 cm-2 sr-1.

(a)

Assuming a high-temperature and high-density limit and optical thin emission.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.